Protoceratops_andrewsiLeptoceratopsidaeZuniceratops_christopheriTuranoceratops_tardabilisAvaceratops_lammersiCentrosaurus_apertusStyracosaurus_albertensisEiniosaurus_procurvicornisAchelousaurus_horneriPachyrhinosaurus_sppChasmosaurus_sppMojoceratops_perifaniaAgujaceratops_mariscalensisPentaceratops_sternbergiiAnchiceratops_ornatusArrhinoceratops_brachyopsTorosaurus_sppTriceratops_sppEotriceratops_xerinsularisOsteologyMaximum ParsimonyBased on reanalysis of the original matrix.Longrich_2010a